Re: xrt_co: - Draft proposal

[Ed Deluca <edeluca@cfa.harvard.edu>]

Do we need full resolution observations? I was assuming 2x2 binned.

Ed
On Aug 20, 2008, at 4:24 PM, Mark Weber wrote:

> That is ~ 1 to 2 CCD pixels per day. This might be do-able with  
> good statistics, I think.
> --Mark
>
>
> On Aug 20, 2008, at 4:14 PM, Leon Golub wrote:
>
>> Sorry, I actually used 15 m/sec in the calculation; I just  
>> mistyped it in my message. The motion is ~15 m/sec X 86,000 sec  
>> per day, so it's 15X86 km = 1290 km per day.
>>
>>
>>
>> Ed Deluca wrote:
>>> The meridional circulation is ~15m/s not 15km/s!!
>>> This is going to be hard to see.
>>> Ed
>>> On Aug 20, 2008, at 4:01 PM, Leon Golub wrote:
>>>> Ed
>>>>
>>>> OK, our visitor has given me his A&A paper, so this is a follow- 
>>>> up on my previous message. (Sorry about sending that to  
>>>> everybody; I hit the wrong button.) Again, I would think that  
>>>> you should stay away from the 7-day lifetime regions, even  
>>>> though they may not rotate with a different differential  
>>>> coefficient. They will, however, become fairly large, so that  
>>>> defining their location might become difficult.
>>>>
>>>> So, what can you do with one-day lifetime regions? At a speed of  
>>>> 15 km/sec, the latitudinal motion will amount to about 1300 km  
>>>> per day. That's about 2 arcsec, and I think is probably about  
>>>> equal to the best you could expect in terms of locating a  
>>>> central position for each XBP.
>>>> That's not so terrible if you measure, say, 100 of them and  
>>>> figure that the statistics go as N^1/2. I'd say you have a  
>>>> chance of succeeding.
>>>>
>>>>
>>>> By the way, you will only have a few 1-day regions regions each  
>>>> day. If you go for 2-day regions (might as well, while you're at  
>>>> it) there won't be many of them.
>>>>
>>>> Leon
>>>>
>>>>
>>>> Ed Deluca wrote:
>>>>> Attached is a draft proposal for a set of observations designed  
>>>>> to measure the
>>>>> meridional circulation from XBPs. It is a difficult and time  
>>>>> consuming task,
>>>>> so please review and comment on the feasibility and science  
>>>>> value. If
>>>>> we think this is worthwhile I will present it to the SSC in  
>>>>> September.
>>>>> Ed
>>>>> ------------------------------------------------------------------ 
>>>>> ------
>>>>> ================================================================== 
>>>>> =
>>>>>       Dr. Edward E. DeLuca           Smithsonian Astrophysical  
>>>>> Observatory
>>>>>       edeluca@cfa.harvard.edu     MS 58
>>>>> Office 617 496 7725                     60 Garden Street
>>>>> Fax     617 496 7577                     Cambridge, MA  02138
>>>>> Cell    508 728 5424                     USA
>>>>> ================================================================== 
>>>>> =
>>>>
>>>> -- 
>>>>
>>>>
>>>> ***********************************************************
>>>> Dr. Leon Golub; Harvard-Smithsonian Center for Astrophysics
>>>> 60 Garden Street, Cambridge MA 02138
>>>> Ph: 617 495 7177; Fax: 617 496 7577
>>>> e-mail: lgolub@cfa.harvard.edu
>>>> http://hea-www.harvard.edu/~golub/HomePage.html
>>>> ***********************************************************
>>
>> -- 
>>
>>
>> ***********************************************************
>> Dr. Leon Golub; Harvard-Smithsonian Center for Astrophysics
>> 60 Garden Street, Cambridge MA 02138
>> Ph: 617 495 7177; Fax: 617 496 7577
>> e-mail: lgolub@cfa.harvard.edu
>> http://hea-www.harvard.edu/~golub/HomePage.html
>> ***********************************************************